Base



FIG. 1 is a perspective view of the base, the chair shown in broken line is for illustrative purposes only, forming no part of the design;

FIG. 2 is a left side elevational view of the base, the chair shown in broken line is for illustrative purposes only, forming no part of the design;

FIG. 3 is a front elevational view of the base, the chair shown in broken line is for illustrative purposes only, forming no part of the design;

FIG. 4 is a rear elevational view thereof, the chair shown in broken line is for illustrative purposes only, forming no part of the design;

FIG. 5 is a right side elevational view of the base, the chair shown in broken line is for illustrative purposes only, forming no part of the design;

FIG. 6 is a top view of the base;

FIG. 7 is a perspective view of the base;

FIG. 8 is a left side elevational view of the base;

FIG. 9 is a right side elevational view of the base;

FIG. 10 is a rear elevational view of the base; and,

FIG. 11 is a front elevational view of the base. 

The ornamental design for a base, as shown and described. 